Battery Alarm is simple Windows Vista program that will monitor your battery life and alert you when you are getting low on power. All settings are customizable so it will notify you when you want and how often you want to be notified. You can also select the sound of the alarm. It is also very easy to install, since you just download the zip file and extract it and install.

Note: Li-ion cannot absorb overcharge. When fully charged, the charge current must be cut off. A continuous trickle charge would cause plating of metallic lithium and compromise safety. To minimize stress, keep the lithium-ion battery at the peak cut-off as short as possible.